What tire pressure should I run on my fat bike?

Tire pressure depends on terrain, rider weight, and tire width. General starting points: packed snow 6–10 PSI, deep powder 4–7 PSI, sand 5–8 PSI, hardpack/trail 10–15 PSI. Heavier riders need slightly more pressure. The goal is the lowest pressure that doesn't feel squirmy or cause rim strikes. A low-pressure gauge (0–15 PSI) is essential—standard pumps are wildly inaccurate at these pressures. Adjust in 0.5 PSI increments; you'll feel the difference.